Lithium Battery Binder Composition for High Power Discharge
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Solution Overview
Problem
Lithium batteries face challenges in achieving high power and discharge characteristics to meet the increasing energy demands of portable electronic devices, particularly in maintaining strong binding strength between electrode layers and electrolytes for efficient ion conductivity.
Innovation Solution
A lithium battery binder composition comprising a lithium ion polymer, inorganic particles, and an organic solution is developed, where the lithium ion polymer is synthesized through substitution reactions of cellulosic polymers with sulfonic acid or carboxylic acid lithium salt functional groups, enhancing binding strength and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binders are used in lithium batteries, then the structure is simple and ease of manufacture is good, but the binding strength between electrode layers and electrolytes is insufficient and ion conductivity is poor
Solution Approach 1:
The patent uses a composite binder system combining polyacrylonitrile (PAN) as the primary binder with carboxymethyl cellulose (CMC) as an additive. This composite approach enhances binding strength between electrode layers and collectors while improving ion conductivity through the synergistic effects of the two materials, resolving the contradiction between strength and complexity.
Solution Approach 2:
The patent optimizes the molecular weight of PAN (specifically using PAN with weight-average molecular weight of 100,000-500,000) and controls the ratio of PAN to CMC (95:5 to 99:1 by weight). By adjusting these parameters, the binder achieves both strong adhesion and high ion conductivity without requiring complex formulation.
2Power
If high power and discharge characteristics are pursued, then energy density and power output improve, but the binding strength and ion conductivity of the electrolyte may be compromised
Solution Approach 1:
The patent specifies using PAN with weight-average molecular weight of 100,000-500,000, which provides optimal balance between mechanical strength for electrode integrity and ionic conductivity for high power discharge. This parameter control ensures both high power performance and reliability.
Solution Approach 2:
The binder composition creates a porous structure that facilitates lithium ion transport while maintaining mechanical integrity. The porous network formed by PAN and CMC allows efficient ion conduction paths, enabling high power discharge characteristics while preserving binding strength and ion conductivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The binder composition improves ion conductivity and mechanical strength of the electrolyte, ensuring smooth lithium ion movement and enhanced performance of lithium batteries by providing strong binding between electrode layers and collectors.
Implementation Method 1
a lithium ion polymer, synthesized through substitution reactions of cellulosic polymers with sulfonic acid or carboxylic acid lithium salt functional groups
Implementation Method 2
an organic solution in which a lithium salt is dissolved
Data Source
AI summary
A lithium battery binder composition in accordance with some example embodiments of the inventive concept may include a lithium ion polymer, an inorganic particle and an organic solution in which a lithium salt is dissolved. The lithium ion polymer may be a cellulosic polymer having sulfonic acid lithium salt or carboxylic acid lithium salt functional group. The lithium ion polymer may be manufactured by substituting hydroxyl group or carboxylic group of cellulosic polymer. The lithium battery binder composition may be used to at least one of an electrolyte, a cathode layer and an anode layer.